Oakland is in a bit of a swoon, having dropped four straight games, the last three to the Boston Red Sox. Back problems have kept first baseman Mark McGwire out of the starting lineup for two of the last three games. The batting average of left fielder Rickey Henderson has dipped to .268. The Orioles could have their hands full with Ontiveros, who continues to be one of baseball's biggest surprises, but then they face Harkey and Stewart, who have been hit hard at times this year. Beware of reliever Jim Corsi, who hasn't allowed an earned run in 12 appearances.